Lifting detection device of lead screw type lifting system

Abstract

The utility model discloses a lifting detection device of a screw rod type lifting system, which relates to the technical field of screw rod type lifting systems and comprises a rack, a plurality of groups of spiral lifting mechanisms are fixedly mounted on the rack, and a differential Hall sensor is arranged below any group of spiral lifting mechanism. According to the design scheme, through the design that the differential Hall sensor is arranged below any group of spiral lifting mechanisms, the chip box is matched with the magnet to detect the rotating angle value of any group of lead screws and output A and B orthogonal pulses, and the lifting height of the platform can be calculated according to the number of turns of rotation of the lead screws; due to the fact that the maximum eccentric value of the induction center of the chip box and the rotation center of the magnet is 0.3 mm, the installation precision of the differential Hall sensor is low, installation is easy and convenient, the production cost of equipment is reduced, the lead screw is directly detected, accumulated errors generated by a transmission mechanism are avoided, and the displacement precision of the platform is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screw-type lifting systems, in particular to a lifting detection device for a screw-type lifting system. Background Art

[0002] The screw lifting system is composed of a box, bearings, screws and other parts. The working principle is: the motor or manual drive screw to rotate, the screw rotation drives the screw nut to move up and down along the screw, so that the parts connected to the screw nut can be lifted and lowered. The screw lifting system has the characteristics of high precision and smooth movement, so it is often used in the working platform of various machine tools, such as polishing machines.

[0003] However, the lifting detection device of the existing spiral lifting system detects the rotation angle of the motor through an encoder, thereby automatically calculating the lifting height of the platform. However, the coaxiality requirement between the encoder and the motor shaft is high, so the processing cost of the motor with an encoder is high, which leads to high production costs of the equipment. In addition, after the power of the motor is transmitted to the screw rod through the transmission mechanism, cumulative errors will occur. If only the output end of the motor is detected by the encoder, the lifting height of the working platform will deviate. The error of the working platform will cause the processed workpiece to be scrapped, affecting the normal use of the equipment. Utility Model Content

[0004] In order to overcome the above-mentioned defects existing in the prior art, the utility model provides a lifting detection device for a screw-type lifting system.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a lifting detection device of a screw-type lifting system, including a frame, on which a plurality of groups of spiral lifting mechanisms are fixedly installed, and the spiral lifting mechanisms are connected to each other through a transmission mechanism, and a differential Hall sensor is provided below any group of the spiral lifting mechanisms, and the differential Hall sensor includes a chip box, and the chip box is fixedly installed on the frame, and a magnet is provided above the chip box, and the magnet is cooperatively installed on the rotating shaft of the spiral lifting mechanism above.

[0006] Furthermore, the spiral lifting mechanism includes a sliding sleeve, which is fixedly installed on the frame, a light rod is movably installed in the sliding sleeve, a limiting boss is provided on the side wall of the light rod, a shaft sleeve is fixedly installed at the bottom of the sliding sleeve, a lead screw is rotatably installed in the shaft sleeve, and a spiral hole matching the lead screw is opened at the bottom of the light rod.

[0007] Furthermore, the magnet is a radially magnetized cylindrical magnet, a fixing frame is fixedly mounted on the top of the magnet, the fixing frame is fixedly mounted on the bottom end of the screw rod, and the distance between the chip box and the magnet is 0.5-2.0 mm.

[0008] Furthermore, the transmission mechanism includes a reduction motor, which is fixedly mounted on a motor mounting frame, which is fixedly mounted on a frame, a driving sprocket is fixedly mounted on the power output shaft of the reduction motor, and several groups of driven sprockets are fixedly mounted on the lower ends of the light rods, and the driving sprocket and the driven sprocket are connected in series through a chain.

[0009] Furthermore, a working platform is fixedly installed on the top end of each group of polished rods.

[0010] The beneficial effect of the utility model is that the design scheme of the utility model is designed to provide a differential Hall sensor under any group of the spiral lifting mechanisms, and detects the angle value of the rotation of any group of screw rods through the chip box and the magnet and outputs A and B orthogonal pulses, so that the lifting height of the working platform can be calculated according to the number of rotations of the screw rod. Since the maximum eccentricity between the induction center of the chip box and the rotation center of the magnet is 0.3mm, the installation accuracy of the differential Hall sensor is low and the installation is relatively simple, thereby reducing the production cost of the equipment, and directly detecting the rotation angle of the screw rod avoids the cumulative error generated by the transmission mechanism, effectively improving the displacement accuracy of the working platform, so that it is suitable for high-precision equipment such as polishing machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0013] Figure 2 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;

[0014] Figure 3 It is the front view of the utility model;

[0015] Figure 4 It is a right side view of the utility model;

[0016] Figure 5 for Figure 4 Schematic diagram of the cross-section structure in the AA direction;

[0017] Figure 6 It is a bottom view of the utility model.

[0018] In the figure: 1. frame, 2. sliding sleeve, 3. polished rod, 31. limiting boss, 32. spiral hole, 4. bushing, 5. lead screw, 6. chip box, 7. magnet, 8. fixing frame, 9. reduction motor, 10. motor mounting frame, 11. driving sprocket, 12. driven sprocket, 13. chain, 14. working platform. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solution of the utility model, the utility model is further described below in conjunction with the accompanying drawings. Obviously, the accompanying drawings described below are only one embodiment of the utility model. For ordinary technicians in this field, without paying any creative work, other embodiments can be obtained based on this drawing and embodiment, which all belong to the protection scope of the utility model.

[0020] according to Figure 1-6 As shown, a lifting detection device of a screw-type lifting system includes a frame 1, on which are fixedly mounted a plurality of groups of spiral lifting mechanisms, preferably four groups of spiral lifting mechanisms, which are interconnected by transmission mechanisms, and a differential Hall sensor is provided below any group of spiral lifting mechanisms, the differential Hall sensor includes a chip box 6, the chip box 6 is fixedly mounted on the frame 1, a magnet 7 is provided above the chip box 6, and the magnet 7 is cooperatively mounted on the rotating shaft of the spiral lifting mechanism above.

[0021] In this embodiment, the spiral lifting mechanism includes a sleeve 2, which is fixedly installed on the frame 1 by bolts. A polished rod 3 is movably installed in the sleeve 2. A working platform 14 is fixedly installed on the top of each group of polished rods 3 by bolts. A limiting boss 31 is provided on the side wall of the polished rod 3. A groove corresponding to the limiting boss 31 is provided on the inner wall of the sleeve 2. The polished rod 3 is slidably installed in the sleeve 2 through the limiting boss 31. A shaft sleeve 4 is fixedly installed on the bottom of the sleeve 2 by bolts. A lead screw 5 is rotatably installed in the shaft sleeve 4 through a bearing. A spiral hole 32 matching the lead screw 5 is provided at the bottom of the polished rod 3. The spiral part of the lead screw 5 is fitted in the spiral hole 32 of the polished rod 3. The polished rod 3 is moved up and down along the slide by rotating the lead screw 5.

[0022] In this embodiment, the magnet 7 adopts a radially magnetized cylindrical magnet, and a fixing frame 8 is fixedly installed on the top of the magnet 7. The fixing frame 8 is fixedly installed on the bottom end of the screw 5 by bolts. The spacing between the chip box 6 and the magnet 7 is 0.5-2.0mm, and the preferred spacing between the chip box 6 and the magnet 7 is 1.0mm. When the platform is raised or lowered, the magnet 7 will rotate synchronously with the screw 5. The differential Hall magnetic angle sensor chip in the chip box 6 senses the Z-axis magnetic field component of the rotating magnet 7 on the XY plane, and outputs two sinusoidal voltage signals as the magnetic field angle changes. The angle value of the screw 5 rotation is obtained after amplification, compensation and calculation by the subsequent dedicated circuit.

[0023] In this embodiment, the transmission mechanism includes a reduction motor 9, which is fixedly mounted on a motor mounting frame 10, and the motor mounting frame 10 is fixedly mounted on a frame 1. A driving sprocket 11 is fixedly mounted on the power output shaft of the motor, and a driven sprocket 12 is fixedly mounted on the lower end of several groups of light rods 3. The driving sprocket 11 and the driven sprocket 12 are connected in series through a chain 13, wherein the driving sprocket 11 cooperates with the outer side of the installation chain 13 to tension the chain 13. The driving sprocket 11 is driven to rotate by the reduction motor 9, and power is transmitted to each group of driven sprockets 12 through the chain 13, thereby driving the light rods 3 to rise and fall synchronously.

[0024] When the utility model is in use, when adjusting the height of the working platform 14, the reduction motor 9 is started, and with the cooperation of the chain 13 and the driven sprocket 12, the reduction motor 9 can synchronously drive all the lead screws 5 to rotate synchronously, and the chip box 6 cooperates with the magnet 7 to detect the rotation angle value of any group of lead screws 5 and output A and B orthogonal pulses, so that the lifting height of the working platform 14 can be calculated according to the number of rotations of the lead screw 5. Since the eccentricity value between the induction center of the chip box 6 and the rotation center of the magnet 7 is 0.3mm at most, the installation accuracy of the differential Hall sensor is low and the installation is relatively simple, thereby reducing the production cost of the equipment, and directly detecting the rotation angle of the lead screw 5 avoids the cumulative error generated by the transmission mechanism, effectively improving the displacement accuracy of the working platform, so that it is suitable for high-precision equipment such as polishing machines.

[0025] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A lifting detection device for a screw-type lifting system, comprising a frame (1), characterized in that: A plurality of groups of spiral lifting mechanisms are fixedly mounted on the frame (1), and the spiral lifting mechanisms are interconnected via a transmission mechanism. A differential Hall sensor is provided below any group of the spiral lifting mechanisms, and the differential Hall sensor comprises a chip box (6). The chip box (6) is fixedly mounted on the frame (1), and a magnet (7) is provided above the chip box (6). The magnet (7) is mounted on the rotating shaft of the spiral lifting mechanism above.

2. The lifting detection device of a screw-type lifting system according to claim 1, characterized in that: The spiral lifting mechanism comprises a sliding sleeve (2), the sliding sleeve (2) is fixedly mounted on a frame (1), a light rod (3) is movably mounted in the sliding sleeve (2), a limiting boss (31) is provided on the side wall of the light rod (3), a shaft sleeve (4) is fixedly mounted at the bottom of the sliding sleeve (2), a screw rod (5) is rotatably mounted in the shaft sleeve (4), and a spiral hole (32) matching the screw rod (5) is provided at the bottom of the light rod (3).

3. The lifting detection device of a screw-type lifting system according to claim 2, characterized in that: The magnet (7) is a radially magnetized cylindrical magnet, a fixing frame (8) is fixedly mounted on the top of the magnet (7), and the fixing frame (8) is fixedly mounted on the bottom end of the screw rod (5), and the distance between the chip box (6) and the magnet (7) is 0.5-2.0 mm.

4. The lifting detection device of a screw-type lifting system according to claim 2, characterized in that: The transmission mechanism comprises a reduction motor (9), the reduction motor (9) is fixedly mounted on a motor mounting frame (10), the motor mounting frame (10) is fixedly mounted on a frame (1), a driving sprocket (11) is fixedly mounted on a power output shaft of the reduction motor, a plurality of groups of light rods (3) are fixedly mounted at the lower ends thereof with driven sprockets (12), and the driving sprocket (11) and the driven sprocket (12) are connected in series via a chain (13).

5. The lifting detection device of a screw-type lifting system according to claim 4, characterized in that: A working platform (14) is fixedly mounted on the top end of each group of polished rods (3).

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